06-12-2014, 10:44 PM
Hi all,
I'm in the process of replacing the HG on my 2.0 HDI as it was pressurising the coolant.
The head has been skimmed (6 thou removed).
Going by the Haynes you are meant to do piston protrusion measurements on all four pistons then cross reference the results to their table to work out the new HG thickness, this is a time consuming ball ache that I could do without. It had a three notch gasket on it and the engineers that did the head skim have said a four notch will be fine, thing is that I don't want to put it all back together to fine it's not.
Going by haynes a 3 notch HG is 1.34mm thick and 4 is 1.38mm so the difference is only 0.04mm and the same for a 5 notch (another 0.04mm). I'm struggling with the relationship between 6 thou (0.15mm) being skimmed off and the difference in gasket thicknesses being only 0.04mm increments.
Thanks.
I'm in the process of replacing the HG on my 2.0 HDI as it was pressurising the coolant.
The head has been skimmed (6 thou removed).
Going by the Haynes you are meant to do piston protrusion measurements on all four pistons then cross reference the results to their table to work out the new HG thickness, this is a time consuming ball ache that I could do without. It had a three notch gasket on it and the engineers that did the head skim have said a four notch will be fine, thing is that I don't want to put it all back together to fine it's not.
Going by haynes a 3 notch HG is 1.34mm thick and 4 is 1.38mm so the difference is only 0.04mm and the same for a 5 notch (another 0.04mm). I'm struggling with the relationship between 6 thou (0.15mm) being skimmed off and the difference in gasket thicknesses being only 0.04mm increments.
Thanks.